Add 70/28 and 84/21
1st number: 2 14/28, 2nd number: 4 0/21
70/28 + 84/21 is 13/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
70/28 = 70 × 3/28 × 3 = 210/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
84/21 = 84 × 4/21 × 4 = 336/84 - Add the two like fractions:
210/84 + 336/84 = 210 + 336/84 = 546/84 - 546/84 simplified gives 13/2
- So, 70/28 + 84/21 = 13/2
In mixed form: 61/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/56+84/21 70/28+84/42 70/84+84/21 70/28+84/63